A:Answer Hello Spike,
That would depend on the type of HDMI device, and the resolution of the content that you are viewing on this TV. You may check the link below to know more about the different refresh rate of this television, it's under "Inputs and Outputs":
http://docs.sony.com/release//SPECS/XBR55X950G_mksp.pdf
Regards,
Zac
Sony Social Support